Teenage Mutant Ninja Turtles
Platform: Commodore 64
Gametype: Undefined
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US version.

First published in USA, then later released in Europe as "Teenage Mutant Hero Turtles". The two versions has some graphic differences in the intro/menus and different ingame music (USA version only got the annoying Hatlelid tune.)

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Differences US vs UK version (from http://carlmuller.co.uk/c64.htm) :

The UK conversion was required because C64s in Europe generally had tape decks, whilst in the USA they had floppy disks (1541s). The graphics, maps and general gameplay ideas were taken from the original US version. The intro and outro sequences were grabbed wholesale, including the programming and music. The in-game programming was however rewritten from scratch, and the existing maps rearranged by myself and Nick Pelling, to allow for a more linear structure suitable for a tape-based game. The UK version in-game music was written by Tiny Williams (Sound Images) for a ludicrously small fee, so low it embarressed the Mirrorsoft Producer (John Norledge).

The Canadian version was written by an uncredited team of programmers, including Alan Stewart (according to the source code) and David Galloway (according to email). Art was credited to Mike Smith, Athena Bax, Michael Hiebert and Tom Singleton. The music was converted by Kris Hatelid from the original by Mike Sokyrka and Ivan Allen. The data came on several Amiga format floppy disks, so I assume that they used an Amiga based development system. It took a long time of playing with "dos2dos" to convert the raw data to PC format. To develop the code we used PDS on MS-DOS. This had a habit of blowing up C64s if it was plugged in wrong.

The two versions can be telled apart by these differences:
Only the UK release has a tape version. 
The Canadian version uses four disk sides; the UK version uses two disk sides. The introduction sequence and compression schemes were different. 
The Canadian version has the in-game score centred; the UK version has it in a static position with leading zeroes. 
The Canadian version is "Teenage Mutant Ninja Turtles". The UK version is "Teenage Mutant Hero Turtles" since the BBC thought that "Ninja" was too strong a word to use in a kids cartoon. IIRC the Konami version may use both names. 
The Canadian version was released some months before the UK version, which was finished on Dec 4th 1990, and rushed to the duplicators by Mike Merrin (who had to wait overnight at the train station to get back, poor soul). 
The Canadian version uses the random access of disc to allow backtracking. The linear nature of tape (carried through to the UK disk version) means it is strictly linear between level loads, although several map segments may be included in a level.

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Description from the packaging:

Fresh from the classic comics comes heroes in a half shell!
Obsessed by revenge, the Teenage Mutant Ninja Turtles are out to rescue lovely April O'Neil, who's been captured by Shredder- a maniac more menacing than an army of mind altered Bruce Lees.
But if they're to succeed, you must command the role of each turtle (one at a time, of course), rumbling through six New York territories patrolled by Ninjitsu Warriors, blood descendants of the deadly Foot Clan.

Along the way, you'll encounter Mouser infested sewers, criminally polluted rivers and villainous streets run by the terrorist team of Bebop and Rocksteady.
To overcome these inhumane hazards, utilize your reptilian brain and map out strategies that will help you locate secret sewage passages. Also be sure to alternate your turtle identity throughout the mission, matching each turtle's strengths with those of the ever changing enemy.
So grab your nunchukus and prepare to put yourself in someone else's shell. Because in this to-the-death adventure, you'll control every leap, chop, slice and dice, until you knock heads with Shredder and either splatter him senseless or get yourself turned into turtle soup.
